How Much Gravel Do I Need for a Driveway?
Learn how to estimate driveway gravel by area, depth, compaction and delivery quantity before starting the work.
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Professional Aggregate Quantity Estimator 2026
Aggregate Calculator - Estimate Gravel, Sand, Ballast & Stone Quantity
Use this free aggregate calculator to estimate how much gravel, sand, ballast, crushed stone, pea shingle, MOT Type 1 or sub-base material you need for construction, concrete, drainage, driveway, patio, landscaping and backfill work.
Enter your area dimensions, depth, material type, density, wastage and compaction allowance to calculate cubic meters, kilograms, metric tonnes and approximate bulk bags in seconds. The tool is fully responsive and built for quick use on mobile at site or desktop during planning.
Estimate gravel, sand, ballast, stone and sub-base quantities.
Converts volume into kg, tonnes and approximate bulk bags.
Includes wastage and compaction adjustment for site accuracy.
Mobile-friendly calculator for contractors and homeowners.
What this aggregate calculator covers
Plan construction materials before ordering and reduce the risk of under-buying or expensive over-ordering.
- Area-based volume from length, width and compacted depth.
- Weight estimate using material density in kg per cubic meter.
- Approximate delivery quantity in tonnes and bulk bags.
- Compaction allowance for sub-base and driveway layers.
- Wastage allowance for uneven ground, spillage and trimming.
- Useful for driveways, concrete aggregate, paths, patios and drainage.
8+
Material Types
Gravel, sand, ballast, crushed stone, pea shingle, scalpings and sub-base.
Fast
Instant Quantity
Get cubic meters, kg, tonnes and bulk bags in one calculation.
2026
Planning Ready
Built for modern estimating, material ordering and construction planning workflows.
100%
Mobile Friendly
Large inputs, readable results and sticky buttons for easy phone use.
Aggregate Calculator for Gravel, Sand, Ballast & Stone Quantity
Enter the length, width and depth of your area. Choose the aggregate material and adjust density, wastage or compaction if needed. The calculator estimates loose volume, compacted volume, total weight and approximate delivery bags.
Selected Material-
Area0 m²
Base Volume0 m³
Adjusted Volume0 m³
Estimated Weight0 kg
Required Quantity0 tonnes
Approximate Bags0 bags
Important: Aggregate density changes with moisture, grading, compaction, voids and supplier source. Use this calculator for estimating and confirm final order quantity with your material supplier or engineer.
Why Use an Aggregate Calculator in 2026?
Material prices, delivery costs and project schedules are tighter than ever. A reliable aggregate quantity estimate helps you order the right amount, control site waste and avoid delays caused by short deliveries.
Better Material Ordering
Estimate tonnes and bags before contacting suppliers, so you can request accurate quotes for gravel, sand, ballast or stone without vague measurements.
Reduce Over-Buying Cost
Over-ordering aggregate can increase material, delivery and disposal cost. The calculator helps you add sensible wastage without guessing too high.
Useful for Site Planning
Contractors, landscapers and homeowners can use the result to plan transport, storage space, wheelbarrow runs and installation time.
Aggregate Quantity Formula for Gravel, Sand, Ballast & Stone
The basic formula is simple, but a good estimate also accounts for density, compaction and waste. This is especially important for driveway sub-base, drainage stone, concrete ballast and compacted fill layers.
Volume Formula
Volume = Length × Width × Depth. For metric projects, length and width are usually in meters, while depth is often measured in millimeters or centimeters.
Weight Formula
Weight = Volume × Density. Density varies by aggregate type, grading, moisture level and compaction state, so supplier data is always best.
Adjusted Quantity
Adjusted Volume = Base Volume + Wastage + Compaction. This gives a safer ordering quantity for real-world site conditions.
What Affects Aggregate Quantity and Weight?
Two projects with the same area can need different quantities because aggregate density, layer depth, ground condition and compaction requirements change the final order amount.
Moisture Content
Wet sand, damp ballast and saturated stone can weigh more than dry aggregate, which affects tonnes and delivery weight.
Particle Size & Grading
Fine sand, 10mm gravel, 20mm aggregate and crushed stone all pack differently, changing void ratio and bulk density.
Compaction Level
Sub-base material and hardcore reduce in thickness when compacted, so extra loose volume is usually required before rolling or plate compaction.
Ground Shape
Uneven ground, slopes, trenches and soft spots increase the quantity compared with a perfectly level rectangular area.
How to Calculate Aggregate Quantity Step by Step
Follow these steps before ordering gravel, sand, ballast or crushed stone for driveways, patios, concrete work, drainage trenches and landscaping areas.
1
Measure the Area
Measure length and width in meters or feet. For irregular shapes, split the area into smaller rectangles and calculate each section separately.
2
Choose Layer Depth
Enter the finished depth. Decorative gravel may be thinner, while driveway sub-base and drainage layers usually need greater depth.
3
Select Material
Choose gravel, sand, ballast, crushed stone, pea shingle or MOT Type 1 so the calculator can apply a suitable density estimate.
4
Review Tonnes & Bags
Use the final tonnes and bag estimate to request supplier quotes, check delivery options and confirm storage space on site.
Typical Aggregate Density and Use Guide
The following values are approximate planning figures. Actual density can vary by supplier, grading, moisture and compaction, so always confirm for final engineering or commercial orders.
| Aggregate Type | Typical Density | Common Uses | Recommended Planning Allowance | Important Note |
|---|---|---|---|---|
| Sharp Sand | 1,550 kg/m³ | Mortar, screed, bedding, paving | 5-10% waste | Moisture can significantly change delivered weight. |
| Building Sand | 1,450 kg/m³ | Bricklaying mortar and general masonry | 5-10% waste | Usually softer and finer than sharp sand. |
| 20mm Gravel | 1,600 kg/m³ | Drainage, concrete aggregate, decorative fill | 5-12% waste | Void ratio changes with rounded or angular stone. |
| Ballast | 1,750 kg/m³ | Concrete mixing and foundations | 5-10% waste | Contains sand and coarse aggregate mixed together. |
| Crushed Stone | 1,700 kg/m³ | Road base, backfill, drainage, concrete | 8-15% waste | Angular particles interlock well when compacted. |
| MOT Type 1 | 2,000 kg/m³ | Driveway base, patio base, road sub-base | 10-25% compaction | Usually compacted in layers for structural stability. |
Aggregate Calculator Tips for Accurate Ordering
Use these practical site tips to make your gravel, sand, ballast or stone estimate closer to the final delivered quantity.
Check Ground Levels
Measure several points across the area. A driveway or garden path that looks flat may have low spots that need extra aggregate.
Plan Delivery Access
Bulk bags and loose tipped aggregate need enough access space. Confirm whether the truck can reach the unloading area before ordering.
Use Engineer Guidance
For structural concrete, roads, foundations, drainage systems or retaining work, follow the engineer’s specification and local standards.
Explore More Construction Calculators
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Open CalculatorRelated Aggregate Guides & Construction Articles
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Understand the difference between common aggregate materials and where each one is used in construction.
Read ArticleBest Aggregate Depth for Paths and Patios
Compare common layer depths for decorative gravel, paving bases, drainage beds and landscaping projects.
Read ArticleAggregate Calculator FAQ
These answers explain how to use the gravel, sand, ballast and stone quantity calculator for more reliable construction estimates.
Multiply length by width by depth to get volume. Then multiply volume by the aggregate density to estimate weight. Add wastage and compaction allowance when ordering for real site conditions.
It depends on the material. Many loose aggregates are around 1.45 to 2.00 tonnes per cubic meter. Sand may be around 1.45-1.60 t/m³, gravel around 1.60 t/m³, ballast around 1.75 t/m³ and MOT Type 1 around 2.00 t/m³.
Yes. A 5-10% allowance is common for simple, level areas. Use a higher allowance for uneven ground, hand placement, small deliveries, trimming, spillage or compacted layers.
For compacted sub-base such as MOT Type 1, many projects allow roughly 10-25% extra loose material depending on layer thickness, moisture, aggregate grading and compaction method. Follow the project specification where provided.
Yes, it can estimate aggregate quantity by volume and weight, but concrete mix design should follow approved standards and project specifications. For structural grades, use an engineer-approved mix design rather than only a generic aggregate calculator.
Estimate Aggregate Quantity Before You Order
Use this aggregate calculator to estimate gravel, sand, ballast, stone, crushed rock and sub-base materials in cubic meters, kilograms, tonnes and bulk bags. It is ideal for construction planning, driveway preparation, drainage work, landscaping, concrete projects and cost estimation.